研究期間：10108~10207;According to the 2007 IPCC report by the United Nations, the average surface temperature of the earth has been rising for 0.6±0.2oC on global scale in the 20th century and will keep increasing at a rate of 0.2oC per two decades in the future. IPCC AR4 predicts that the average sea level of the earth will rise by 0.28-0.58 meter by the year 2100. The impact of climate change will lead to the flooding of the low-land areas by the sea and the influx of sea water on land. Consequently, it will affect our water resources or water supply. The climate change will also increase the frequency of extreme weather (heavy rainfall and drought), thus flood will likely to occur more often especially in those low land areas by the sea. The calamities of drought and landslide hazard will also increase as the result. Eventually, the lives, properties, and security of those people in the areas affected by climate change will be seriously threatened. Global warming may lead to more and stronger tropical cyclones (typhoons and hurricanes) with stronger gusty winds and heavier rainfalls; it may also increase atypical (or abnormal) tropical cyclones, or enhance its temporal and spatial variations. Because Taiwan is a subtropical island located on the path frequently passed by typhoons, we need to enhance our understanding of the possible impacts of global warming on typhoon’s occurrence frequency, intensity, and tracks, in order to prepare for typhoon damage and protect human lives and property. For abnormal typhoons, our current understandings are quite limited for the structural characteristics, their associated mesoscale convective systems, and the heavy rainfalls induced by the accompanying southwesterly flows. This project is proposed to analyze the structural characteristics and the accompanying precipitation and winds for these atypical typhoons. The conceptual models will be established in order to help the weather forecasters identify thes abnormal typhoons.
